Features:3 Heating Modes: These insoles can be powered through a USB interface, a power adapter, or a power bank (5V/2A or higher). Continuous heating is achieved while they are energized.Soft and Comfortable: Made of EVA elastic fiber material, these insoles offer superior comfort. Their super-thin design, with a thickness of only 4mm, ensures maximum flexibility. You can easily cut them along the free-cutting line to fit your shoes.Wash and Care: These insoles are hand-washable. After cleaning, ensure they are completely dry before use.Specification:Material: EVA Elastic FiberColor: BlackTemperature: Approximately 40-50CVoltage: 5V / 2AOptional Sizes: 35-40, 41-46Warm Tips:When not in use, unplug the power supply to prevent prolonged heating.Do not wear these electric insoles during strenuous exercise to protect the heating element.Package Includes:1 Pair of USB Heating Insoles1x USB Cable1x User Manual